Recent Posts

BRI1 and BAK1 interact with G proteins and regulate sugar-responsive growth and development (Nature Comms.)

Sensing sugar is important, especially if you are a plant, as it helps you to decide whether to invest it in new tissues, or rather store it for later. Low levels of glucose promote seedling growth, while high concentrations repress the development. Peng et al. discovered that brassinosteroid signaling…

Comparative analysis of Arabidopsis ecotypes reveals a role for brassinosteroids in root hydrotropism (Plant Physiol.)

Plastic plant growth serves them well, as it ensures efficient exploration of the environment. A plant can direct the growth of its roots towards the water, but the mechanisms behind hydrotropism are still to be fully understood. Miao et al. performed a screen of 30 Arabidopsis accessions for altered…

RH8-PP2CA interaction in ABA signaling ($)

It is well understood that abscisic acid (ABA) inhibits PPC2A phosphatase activity, which subsequently relieves phosphate-induced inhibition of a kinase interacting partner. This pathway composes the ‘core’ ABA signaling pathway, activating process involved in the ABA response such as stomatal closure…

Review: The role of auxin in cell wall expansion (OA)

Cell wall is the outermost boundary for a cell. For the protection of cell, it maintains its rigidity. At the same time, for providing the shape of cells, it is capable of becoming flexible. This means that the cell wall has the capacity to maintain both rigidity and flexibility based on the requirement.…

Photoactivated CRY1 and phyB interact directly with AUX/IAA proteins to inhibit auxin signaling in Arabidopsis (OA)

So far we know that light inhibits hypocotyl cell elongation and that the master regulatory plant hormone auxin induces hypocotyl elongation. Light signal depends on cryptochrome (CRY1) and phytochrome (PhyB). Auxin signal follows the traditional TIR1/AFB receptor-mediated degradation of AUX/IAA repressor.…

Review: The root transition zone: A hot spot for signal crosstalk (TIPS) ($)

Plant roots are an excellent system to study the interactions between endogenous (phytohormones) and exogenous (abiotic stresses) stimuli. The root can be considered as three sections: the meristematic zone (where active cell division occurs), the transition zone (acting as a boundary between meristem…

AUX1-mediated root hair auxin influx governs SCFTIR1/AFB-type Ca2+ signaling (Nature Comms)

The phytohormone auxin is transported in a polar fashion through PINs (PIN-FORMED) and PGPs (P–GLYCOPROTEIN) as auxin efflux carriers and AUX1 and LAXs (LIKE-AUX1) as influx carriers. Previous experiments from oat coleoptiles and corn root hairs indicate that one of quickest auxin responses is cell…

Deep evolutionary roots for the plant hormone auxin (eLIFE)

Auxin is an endogenous plant hormone that orchestrates complex tissue development across diverse green plant lineages. In a recent article, Mutte et al. performed a deep phylogenomics analysis of known and predicted auxin signalling mechanisms present in green plants and their algal predecessors. This…

Polyamines regulate strawberry fruit ripening by abscisic acid, auxin, and ethylene (Plant Physiol)

Polyamines, which include putrescine [NH2(CH2)4NH2], spermidine [NH2(CH2)4NH(CH2)3NH2], and  spermine [NH2(CH2)3NH(CH2)4NH(CH2)3NH2], are widespread in nature. Although their mechanisms of action remain largely unresolved, they have demonstrated roles in plants ranging from abiotic stress tolerance…